improve tests, integrate into styler.clear()

Author: attack68

pandas/io/formats/style.py

@@ -615,6 +615,8 @@ def clear(self) -> None:
         Returns None.
         """
         self.ctx.clear()
+        self.tooltip_styles = []
+        self.set_tooltip_class(name="pd-t", properties=None)
         self._todo = []
 
     def _compute(self):

pandas/tests/io/formats/test_style.py

@@ -1697,20 +1697,28 @@ def test_tooltip_render(self):
         ttips = pd.DataFrame(
             data=[["Min", ""], [np.nan, "Max"]], columns=df.columns, index=df.index
         )
-        s = Styler(df, uuid="_").set_tooltips(ttips)
+        s = Styler(df, uuid="_").set_tooltips(ttips).render()
         # test tooltip table level class
-        assert "#T__ .pd-t {" in s.render()
-        # test 'min' tooltip added
+        assert "#T__ .pd-t {\n          visibility: hidden;\n" in s
+        # test 'Min' tooltip added
         assert (
             "#T__ #T__row0_col0:hover .pd-t {\n          visibility: visible;\n    }  "
             + '  #T__ #T__row0_col0 .pd-t::after {\n          content: "Min";\n    }'
-            in s.render()
+            in s
         )
-        # test 'max' tooltip added
+        assert (
+            '<td id="T__row0_col0" class="data row0 col0" >0<span class="pd-t"></span></td>'
+            in s
+        )
+        # test 'Max' tooltip added
         assert (
             "#T__ #T__row1_col1:hover .pd-t {\n          visibility: visible;\n    }  "
             + '  #T__ #T__row1_col1 .pd-t::after {\n          content: "Max";\n    }'
-            in s.render()
+            in s
+        )
+        assert (
+            '<td id="T__row1_col1" class="data row1 col1" >3<span class="pd-t"></span></td>'
+            in s
         )
 
     def test_tooltip_ignored(self):